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1·Drill a hole in the centre of the blank PCB so that the copper pipe is a tight fit in the hole.

在空白电路板的中间 钻一个 小孔，使得铜管正好紧紧地固定在中间。

2·The City Watch barracks is a centre for pursuits worthy of true soldiers, a place for exercises, drill and weapons practice.

警备军营作为实战步兵基地，提供各种操练和武器练习设施。